The invention relates to a rolling mill segmented sled feeding device. The device comprises a main rolling area man-machine interface, the output end of the main rolling area man-machine interface is connected with the input end of a main rolling area PLC system, the input end of the main rolling area PLC system is connected with the output end of an AGC control system, the input end of the AGC control system is connected with the output end of an AGC system man-machine interface, the output end of the main rolling area PLC system is connected with the input end of a main transmission control system, and the output end of the main transmission control system is connected with a main rolling mill. By means of selection of rolled pieces rolling passes and arrangement of segmented sled feeding, the problem that the quantities of sleds needed by the rolled pieces in a rough rolling pass and a fine rolling pass are different is well solved; besides, feeding of the sleds can be achieved or omitted once in an emergency. The method is used on 2500-mm production lines of the Shaoguan steel plate factory, well solves the problem that tilting and bending of the rolled pieces are uncontrollable, and has good effect in the actual use process.